feat: introduce MR metrics (#277)

Signed-off-by: Arthur Loiselle <arthur.loiselle@dialogue.co>

cmd/provider/main.go

@@ -25,6 +25,8 @@ import (
 	"github.com/crossplane/crossplane-runtime/pkg/certificates"
 	"github.com/crossplane/crossplane-runtime/pkg/controller"
 	"github.com/crossplane/crossplane-runtime/pkg/feature"
+	"github.com/crossplane/crossplane-runtime/pkg/reconciler/managed"
+	"github.com/crossplane/crossplane-runtime/pkg/statemetrics"
 	"go.uber.org/zap/zapcore"
 
 	"k8s.io/client-go/tools/leaderelection/resourcelock"
@@ -35,6 +37,7 @@ import (
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/cache"
 	"sigs.k8s.io/controller-runtime/pkg/log/zap"
+	"sigs.k8s.io/controller-runtime/pkg/metrics"
 
 	xpv1 "github.com/crossplane/crossplane-runtime/apis/common/v1"
 	"github.com/crossplane/crossplane-runtime/pkg/logging"
@@ -53,6 +56,7 @@ func main() {
 		debug                      = app.Flag("debug", "Run with debug logging.").Short('d').Bool()
 		syncInterval               = app.Flag("sync", "Sync interval controls how often all resources will be double checked for drift.").Short('s').Default("1h").Duration()
 		pollInterval               = app.Flag("poll", "Poll interval controls how often an individual resource should be checked for drift.").Default("10m").Duration()
+		pollStateMetricInterval    = app.Flag("poll-state-metric", "State metric recording interval").Default("5s").Duration()
 		pollJitter                 = app.Flag("poll-jitter", "If non-zero, varies the poll interval by a random amount up to plus-or-minus this value.").Default("1m").Duration()
 		timeout                    = app.Flag("timeout", "Controls how long Terraform processes may run before they are killed.").Default("20m").Duration()
 		leaderElection             = app.Flag("leader-election", "Use leader election for the controller manager.").Short('l').Default("false").Envar("LEADER_ELECTION").Bool()
@@ -101,12 +105,23 @@ func main() {
 
 	kingpin.FatalIfError(apis.AddToScheme(mgr.GetScheme()), "Cannot add terraform APIs to scheme")
 
+	metricRecorder := managed.NewMRMetricRecorder()
+	stateMetrics := statemetrics.NewMRStateMetrics()
+
+	metrics.Registry.MustRegister(metricRecorder)
+	metrics.Registry.MustRegister(stateMetrics)
+
 	o := controller.Options{
 		Logger:                  log,
 		MaxConcurrentReconciles: *maxReconcileRate,
 		PollInterval:            *pollInterval,
 		GlobalRateLimiter:       ratelimiter.NewGlobal(*maxReconcileRate),
 		Features:                &feature.Flags{},
+		MetricOptions: &controller.MetricOptions{
+			PollStateMetricInterval: *pollStateMetricInterval,
+			MRMetrics:               metricRecorder,
+			MRStateMetrics:          stateMetrics,
+		},
 	}
 
 	if *enableManagementPolicies {

internal/controller/workspace/workspace.go

@@ -26,6 +26,7 @@ import (
 	"time"
 
 	"github.com/crossplane/crossplane-runtime/pkg/logging"
+	"github.com/crossplane/crossplane-runtime/pkg/statemetrics"
 	"github.com/pkg/errors"
 	"github.com/spf13/afero"
 	corev1 "k8s.io/api/core/v1"
@@ -145,12 +146,18 @@ func Setup(mgr ctrl.Manager, o controller.Options, timeout, pollJitter time.Dura
 		managed.WithRecorder(event.NewAPIRecorder(mgr.GetEventRecorderFor(name))),
 		managed.WithTimeout(timeout),
 		managed.WithConnectionPublishers(cps...),
+		managed.WithMetricRecorder(o.MetricOptions.MRMetrics),
 	}
 
 	if o.Features.Enabled(features.EnableBetaManagementPolicies) {
 		opts = append(opts, managed.WithManagementPolicies())
 	}
 
+	if err := mgr.Add(statemetrics.NewMRStateRecorder(
+		mgr.GetClient(), o.Logger, o.MetricOptions.MRStateMetrics, &v1beta1.WorkspaceList{}, o.MetricOptions.PollStateMetricInterval)); err != nil {
+		return err
+	}
+
 	r := managed.NewReconciler(mgr,
 		resource.ManagedKind(v1beta1.WorkspaceGroupVersionKind),
 		opts...)